Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality e^(-a^2) >= 1/4, .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         e ^ ( -a ^ 2 ) >= 1 / 4 ,         (1)

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    From inequality(1)：
         -1.17741 ≤ a ≤ 1.17741

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    The final solution set is :
         -1.17741 ≤ a ≤ 1.17741
[ 2/2Inequality]
    Assignment:Find the solution set of inequality e^(-a^2) <= 3/4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         e ^ ( -a ^ 2 ) <= 3 / 4         (1)

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    From inequality(1)：
         a ≤ -0.53636 或  a ≥ 0.53636

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    The final solution set is :
         a ≤ -0.53636 或  a ≥ 0.53636

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